It connects to the website but it stoped with an "TLSv1.2 Alert Fatal description Certificate unknow.'

I'm going to guess you are not running with Oracle Java 1.8.0_111 or later. The my.openhab servers had to update their SSL cert a few months ago and they used LetsEncrypt, but Oracle Java did not add that CA as trusted until 111. OpenJDK has lots of problems and you should not be running OH on it anyway, but it does not yet include LetsEncrypt as a trusted CA.

Unfortunately I found that version of Java is not available yet on Raspbian via apt-get. The fix is to install the Let's Encrypt root certificate into the Java keystore file. Somebody has probably already explained that somewhere.

I did -almost- the same, but used the WebUpd8 installer in @Udo_Hartmann link to get automated java updates in the future (I wasn't aware that this is not done automatically through apt-get update/upgrade on a Raspbian Jessie installation on a Raspberry Pi), but you have to make a slight change to the tutorial: instead of su - use sudo su: sudo su echo "deb http://ppa.launchpad.net/webupd8team/java/ubuntu xenial main" | tee /etc/apt/sources.list.d/webupd8team-java.list echo "deb-src http://ppa&hellip;